| /* -*- mode: c; c-basic-offset: 8; -*- |
| * vim: noexpandtab sw=8 ts=8 sts=0: |
| * |
| * ocfs2_buffer_head.h |
| * |
| * Buffer cache handling functions defined |
| * |
| * Copyright (C) 2002, 2004 Oracle. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public |
| * License along with this program; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 021110-1307, USA. |
| */ |
| |
| #ifndef OCFS2_BUFFER_HEAD_IO_H |
| #define OCFS2_BUFFER_HEAD_IO_H |
| |
| #include <linux/buffer_head.h> |
| |
| int ocfs2_write_block(struct ocfs2_super *osb, |
| struct buffer_head *bh, |
| struct ocfs2_caching_info *ci); |
| int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block, |
| unsigned int nr, struct buffer_head *bhs[]); |
| |
| /* |
| * If not NULL, validate() will be called on a buffer that is freshly |
| * read from disk. It will not be called if the buffer was in cache. |
| * Note that if validate() is being used for this buffer, it needs to |
| * be set even for a READAHEAD call, as it marks the buffer for later |
| * validation. |
| */ |
| int ocfs2_read_blocks(struct ocfs2_caching_info *ci, u64 block, int nr, |
| struct buffer_head *bhs[], int flags, |
| int (*validate)(struct super_block *sb, |
| struct buffer_head *bh)); |
| |
| int ocfs2_write_super_or_backup(struct ocfs2_super *osb, |
| struct buffer_head *bh); |
| |
| #define OCFS2_BH_IGNORE_CACHE 1 |
| #define OCFS2_BH_READAHEAD 8 |
| |
| static inline int ocfs2_read_block(struct ocfs2_caching_info *ci, u64 off, |
| struct buffer_head **bh, |
| int (*validate)(struct super_block *sb, |
| struct buffer_head *bh)) |
| { |
| int status = 0; |
| |
| if (bh == NULL) { |
| printk("ocfs2: bh == NULL\n"); |
| status = -EINVAL; |
| goto bail; |
| } |
| |
| status = ocfs2_read_blocks(ci, off, 1, bh, 0, validate); |
| |
| bail: |
| return status; |
| } |
| |
| #endif /* OCFS2_BUFFER_HEAD_IO_H */ |